Transformerless Power Supply (Second Project)

sarveshnarkar07·KiCad-Projects·02 - Transformerless Power Supply/Transformerless Power Supply (Second Project).kicad_pcb

Transformerless Power Supply (Second Project) PCB layout, top view — open source board by sarveshnarkar07

About the Transformerless Power Supply (Second Project) PCB

Transformerless Power Supply (Second Project) is an open source PCB design by sarveshnarkar07, published on GitHub. It is a 2-layer board measuring 54.5 × 35.8 mm, with 18 components from 12 distinct parts.

Other key parts include the LM7805_TO220. By type, the board carries 7 diodes, 4 capacitors, 4 resistors, 2 connectors and 1 IC.

It belongs with the power & battery designs in this gallery.

From the project

1.12V AC to DC Converter (KiCad)

A KiCad project for a transformerless power supply design.

- Designer: Sarvesh Narkar - Date: 2026-07-11 - KiCad Version: 10.0

This project is for educational purposes.

Transformerless Power Supply (Second Project), from the project README — From the project README

Main components on the Transformerless Power Supply (Second Project)

Transformerless Power Supply (Second Project) bill of materials (BOM)

18 components, 12 distinct parts.

Qty	Part	Footprint	Refs
1	LM7805_TO220	TO-220-3_Vertical	U1
2	Screw_Terminal_01x02	TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm	J1, J2
4	1N4007	D_DO-41_SOD81_P10.16mm_Horizontal	D1, D2, D3, D4
2	D_Zener	D_A-405_P7.62mm_Horizontal	D5, D6
1	LED	LED_D5.0mm	D7
1	0.1uF	C_Disc_D4.7mm_W2.5mm_P5.00mm	C1
1	1000uF	CP_Radial_D10.0mm_P5.00mm	C2
1	470uF	CP_Radial_D10.0mm_P3.80mm	C3
1	225k/2.2uF	C_Rect_L18.0mm_W6.0mm_P15.00mm_FKS3_FKP3	C4
2	20k	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R1, R2
1	1M	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R3
1	2.2k	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R4

Transformerless Power Supply (Second Project) design files

The KiCad project lives in the sarveshnarkar07/KiCad-Projects repository on GitHub; these links point at the commit this page was built from.

Transformerless Power Supply (Second Project): common questions

How big is the Transformerless Power Supply (Second Project) PCB?

The Transformerless Power Supply (Second Project) measures 54.5 × 35.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Transformerless Power Supply (Second Project)?

18 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Transformerless Power Supply (Second Project) design files?

From the sarveshnarkar07/KiCad-Projects repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Transformerless Power Supply (Second Project) design in my own project?

The repository has no license, so all rights stay with sarveshnarkar07. Use it as a reference, and ask the author before reusing the design.

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